Here are three great group project ideas to reinforce the concepts of velocity, transportation, and energy. In small groups, learners construct adjustable ramps, predict, and then test to determine the affects of altering velocity, ramp angle, and vehicle weight. They discuss energy types and sources and how substituting a new energy source would change the functioning of their vehicles. The day's activities culminate when each child researches the evolution of one mode of transportation, through a timeline that begins in the year 1800 and ends in the year 2105. Neat stuff!